showmount: add page

pages/windows/showmount.md

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+# showmount
+
+> Display information about NFS filesystems on Windows Server.
+> More information: <https://docs.microsoft.com/windows-server/administration/windows-commands/showmount>.
+
+- Display all exported filesystems:
+
+`showmount -e`
+
+- Display all NFS clients and their mounted directories:
+
+`showmount -a`
+
+- Display all NFS mounted directories:
+
+`showmount -d`
+
+- Display all exported filesystems for a remote server:
+
+`showmount -e {{server_address}}`